Jawabanmu

2014-08-31T20:53:07+07:00
A. Luas = 2 x phi x r (r+t)
= 2 x 3,14 x 10 ( 10+30)
= 62,8 + 40
= 102,8 cm^2

b. Volume = phi x r^2 x t
= 3,14 x 10 x 10 x 30
= 9420 cm^3
2014-08-31T20:57:02+07:00